Highly sensitive acetone gas sensor based on gold nanoparticles modified W18O49 porous polymeric spheres

A two-step solvothermal approach was used to create porous polymeric spheres of W 18 O 49 modified with gold nanoparticles. Various characterizations of the material were carried out by XRD, SEM, etc., and the results show that the material is highly crystalline and the surface has a porous nature, in addition, the addition of gold substantially improves the adsorbed oxygen content. The results of the gas sensitivity test showed that the gold nanoparticle-modified W 18 O 49 porous polymeric spheres showed a significant improvement in performance compared to pure W 18 O 49 . The gold nanoparticle-modified W 18 O 49 porous polymeric spheres demonstrated an increased reaction value to 100 ppm acetone at a lower temperature of 220 °C (S=66, 2.57 times that of the pure material), a quick response/recovery time (5s/12s), as well as strong selectivity and stability. W 18 O 49 porous polymeric spheres enhanced with gold nanoparticles have good potential for acetone gas detection and are likely to be used in high-performance sensors.